<template>
  <li
    @mouseenter="num = id"
    @mouseleave="num = 1"
    :style="{background: num === id ? '#ccc' : ''}"
  >
    <label>
      <input type="checkbox" :checked="done" @change="changeDone(id)"/>
      <span>{{content}}</span>
    </label>
    <button class="btn btn-danger"
            :style="{display: num === id ? 'block':'none'}"
            @click="deleteById(id)"
    >删除</button>
  </li>
</template>

<script>
export default {
  name:"Item",
  props:["id","content","done","changeDone","deleteById"],
  data(){
    return{
      num:1
    }
  }
}
</script>


<style>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}
li .done {
  color: #666;
  text-decoration: line-through;
}
</style>